Screw-driver machine



July 15, 1924. 1,501,695

w. wuRDAcn v SCREW DRIVER MACHINE A Filed Sept. 3. 1921 Patented July 15, 1924.

UNITED STATES WILLIAM WURDACK, OF ST. LOUIS, MISSOURI.

SCREW-DRIVER MACHINE.

Application filed September 3, 1921. Serial No. 498,381.

To all whom t may concern:

Be it known that l., l/VrLLmM VURDACK, a citizen of the United States, residing at the city of St. Louis, State of Missouri, have invented a certain new and useful lmprovement in Screw-Driver Machines, of which the followingis a specification, reference being had to the accon'ipanying drawing, forming a part thereof.

This invention relates generally to screwdriver machines, and, more particularly, to a certain new and useful improvement in screw-driver machines of the automatic power driven type, the principal object of my present invention being to provide a machine of the class stated which may be economically manufactured, whichv is compact and durable in form and construction, in which manual holding of the screw'to be driven is entirely obviated, and by which the held screw is quickly and efliciently driven to its seat in the work being operated upon.

With the above and other objects in View my present invention resides in the novel features of form, construction, arrangement, and combination of parts hereinafter' described and afterwards 'pointed out in the claims.

In the accompanying drawing,

Figure 1 is a longitudinal sectional elevation of a screw driver machine constructed in accordance. with and embodying my invention;

Figure 2 is a front elevational-view of the machine;

Figure 3 is an enlarged sectional elevation of the machine taken approximately on the line 3 3, Figure 1, showing fragmentally the magnetic screw-holding means'V of the machine; and .l

VFigure 4 is an enlarged perspective view of a portion, approximately one-half, of the pole-pieces of the magnetic screw-holding-means.

Referring now more in detail to the said drawing, which illustrates a practical embodiment of myv invention and in which like reference-characters refer to like parts throughout the several views, the base of the machine is preferably in the form of an open approximately rectangular frame 1 adapted, in use, to be. bolted or otherwise fixed to a work-table or other suitable support, not shown. The frame 1 is formed l n l o l with journal-box sections or bearings 2 2, mounted for rotation in which is a shaft 3. Surmountlng the base-frame 1 and rigidly attached thereto by bolts or the like 4,-

is a cap 5 having thecomplementing journal-box sections or shaft-bearings 6.

Loosely mounted on the shaft 3, is a pulley 7 adapted for driven connection by means of a belt or the like with a suitable source of power; and disposed upon shaft 3 forwardly of the pulley 7, is a clutchmember 8. The clutch-member 8 is rigidly fixed, as by a pin 9, to'rotate with shaft 3, .and its hub 10 preferably abuts for rotary movement against a wall of the machine-housing formed by the base-frame 1 and cap 5 to hold the shafty 3 against longitudinal or axial movement in one direction. Y

l may state here that shaft 3 is suitably held from axial movement in the other direction as by a plate or disk 11 xedf to the machine-housing over the rear end of the shaft, that for the lubrication of the shaft 3 in the boxes 2, l provide. they oil'- holes 12-12, and for the lubrication lof nthe pulley 7 l provide in shaft 3 communicating longitudinal and cross ducts 13 and 14, Yrespectively, leading from one journal boxu2 to the pulley, as best seen in Figure v1.

The clutch-member 8 is preferably faced with a disk 15 of leather or other suitable material, and disposed upon shaft3 with its opposite ends abutting against the. rear end of a hub-extension 16 of the pulley 7 and a ring 17 fixed on the shaft y3, asbest seen in Figure l, is an extensile -coiled spring 18 for yieldingly maintaining or holding the pulley 7 at its forward face in frictional driving engagement with the face 15 of clutch-member 8. Y

The main shaft 3 projects forwardly beyond the machine-housing, and formed in its so projecting end is a threaded socket 19, in which is firmly seated a screw-driver bit or tool '20. And loosely fitted over the projecting end of shaft 3 to slide axially thereupon, is a block 21, .which is yieldingly actuated in a forward direction by a spring 22 coiled about the shaft 3 and interposed between the block 21 and the forward end shaft-bearing formedv by the complementing journal-box members or sections 2land 5, as seen in Figure 1, the axial movement of the block 21 in such forward direction being limited adjustably by a stop in the torni ola rod 2 3 rlined at Aits rear end to the machine trameY and projecting 'forwardly through a slot 24 in block 2l and at its forward end carrying a nut` 25` adapted for adjustable engagement with the block 2l, as illustrated in Figures l and 2. Due also to the straddling engagement of the rod 23 by the movable block: 2i at its slot or bifurcation 2d, the block 2l is held against movement other than axial on and relatively toA the shaft 3 and its carried bit or tool 20.

The` bloc-li 2l constitutes the supporting part of the screw-holding means propeig which Yincludes a permanent magnet 26 preferably of the horse-shoe type and polepiec-es2v7. The poles 2i", as showin are n'iade asV two complementing parts which are fixed to the legs of the magnet 2G by means of a bar 2 8 and screws 29 extending through the 1 ar 28 and the pole elements 2? into the egsof thel magnet, as clearly illustrated in vEigure 3. the adjacent ends of the pole pieces 27 being suitably spaced one from the other to provide a magnetic grap and also shaped to provide not only tor lengthwise rotary working movement therebetween ot' the .tool or bit 20, but also a seat. as at 30, for the head of the s'rew 3L shown inpdotted lines in Figure l, to be driven. lvThe magnetp26 and its poles 2T are disposed approximately tlatwise upon the bloc-.lz 2l with thescrew-seat 30 in operative alignment andl registrationl with the bit or tool 20, andare d etac-hably or renewably fixed in such positionl by means of a filler block 32 resting upon the block 2l between the legs of magnet 26 and a .face-plate 33 whichoverlaps the magnet legs,V as well as also the pole-pieces2 and their' securing-bar 28, securing or fastening' screws Bil being passed through the plate 33 and block into th supporting-block 21. By preference7 ti face-plate is additionally secured as by a screw 35 which seat-s in the hub ot the block 2l, as seen in Figure i; and l may add that the pole elements 27 are held magneti*- cally insulated one from the other by means of interposed tongues 36 and 3T on the bar 28 and iller-block 3l., the insulation further including the making of the supportii block 21, the bar 28, the filler the facerplate 33, and the tongues 36 and of bi f In .Figure l, .l have shown by dotted lines the screw 8i] magnetically held at its head to the seat 30 by the poles 2T and a piece of worlifinto which the screw is to be driven.

In operation, presumingY the pulley 7 to be belted to, and being rotated byf a suitable source of power, and the shaft 3 and its carried tool 20 to be consequently also rotated under the yielding-frictional engage-- ment between the pulley and clutchanember 8.y A screw 31 is now manually or otherwise placed with its head upon seat 30 and between the pole-pieces 27, which head bridges the pole-pieces and hence the screw is magnetically held. The work with a screw-seat is then Jforced toward the held screw 3l, and in such movement or travel the work, the bloclr 21 is moved rearwardly against the tension of spring 22, the held screw being thereby carried into engage ment with the rotating driver or tool 20, Whose point, after finding the nicl; or groove in the screw-head, turns the screw into the seat in the work. held against the tool 20 until the screw is fully seated, at which time rotation of the tool, is stopped and brealage of parts obviated, which act is permitted by reason of relative slipping between the clutch 8 and pulley 7. After manual pressure is relieved from the work, the spring 22 restores the block 2l and its carried parts to starting or normal position as determined by the stopnut 25.

F rom actual use, I have found my new machine to be exceedingly fast and eilicient and to `effect a considerable saving in time and labor.

I am aware that changes in the form, construction7 arrangement, and combination of the several parts of my new screw-driver machine may be made andsubstituted for those herein shown and described without departing from the nature and principle of my invention.-

Having' thus described my invention what I claim and desire to secure by Letters Pat. ent is:

l. A machine of the cla-ss described Vincluding a rotary screw-driver and means for rotarily actuating the same, in combination with means comprising a-magnet having an apertured seatproviding pole-piece Vfor magnetically holding a screwin position for driven engagement by the screw-driver.

2. A machine of the class described including a rotary screw-driver and means for rotarily actuating the same, in combination with means for magnetically holdingascrew to be driven. said means comprising a lmagnet having an apertured seat-providing polepiece and being shifta-ble toward the screwdriver for driven engagement Iwith the held screw by the screw-driver.

3. A machine of the class described including a rotary screw-driver and means for rotarily actuating` the sames 'in combination with means for magnetically holdinga screw to be drivein said means being sliiitable to.- ward the screw-driver for driven engagement with the held screw by the screw-.driver and comprisinga magnet and ra pair of pole-pieces lined to the poles of the magnet, the pole-pieces being magnetically spaced and insulated one from the other and co-opv The work and screw areY lll) eratively shaped to provide a working aperture for the screw-driver and a seat for the screw-head.

4. A machine of the class described including a rotary screw-driver and means for rotarily actuating the same, in combination with means for magnetically engaging and holding a screw at its head, said means being apertured for accommodating driven engagement Vby the screw-driver with the screw.

5. A machine of the class described including a rotary shaft, a screw-driver carried for rotation by and with the shaft, and means for holding a screw to be driven in position for driving engagement by the screw-driver, in combination with means comprising a power-pulley loosely mounted on the shaft, and a clutch fixed on the shaft and normally in frictional engagement with the pulleyV for rotarily actuating the shaft and its carried screw-driver to seat the held screw in the work, the clutch being adapted to slip in its engagement with the pulley when the screw-driver is in engagement with the screw and the screw fully seated.

6. A machine of the class described including a rotary shaft, a screw-driver carried for rotation by and with the shaft, and means for holding a screw to be driven in position for driving engagement by the screw-driver, in combination with a power pulley loosely mounted on the shaft, a clutch member fixed on the shaft, and means comprising a spring for yieldingly holding the pulley and clutch in frictional engagement for rotarily actuating the shaft and its carried screw-driver t0 seat the held screw in the work, the clutch being adapted to slip upon the pulley when the screw-driver is in engagement with the screw and the screw fully seated in the work.

In testimony whereof, I have signed my name to this specification.

WILLIAM VVURDACK,V 

